Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bfdf004d65607e…

MALICIOUS

PDF

84.8 KB Created: 2021-07-29 18:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d78c5ac2b34c9b7e64614e8ab3f88c7 SHA-1: 902a2f9df4971eaf4fb05e4c410e7bbbe13d6a1b SHA-256: 91bfdf004d65607e00aa86489587bbaf5feb0db5157b519b9212e1c08225c4ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to unknown PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69a6875ee---46835209619.pdf In PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/rorumuvugasobe.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/361dfccce3a5623d91ee980859f424d7/liruraranaxadep.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/34364930674.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/25901439917.pdfIn PDF document text
    • https://zold-kommando.hu/files/87056550398.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c264af749c2---19024130400.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68604113606.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/zazeronasibakufa.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/finopujefanebuko.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6baaba1ad---rinaxepowikavofofoje.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e0220d2a---68133458025.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050603515773499.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b22392689c1---mikuwaselopunazajamete.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/baxulot.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/figinaw.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/70041637170.pdfIn PDF document text
    • https://iword.de/userfiles/file/mefinifuxip.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1904c8590---18454070027.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/c3qd9fh3mse9hjban126fk869a/puzojibumepezugata.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7fdedf9ae---tesil.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210601175139.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0c3981a4b8bbddec106fa59269302a75/welapavofi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858aacdd304---69547998602.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/56540590693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+10st+in+lbsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 14828 bytes
SHA-256: e33f342f8235eb86843ad5064f13a9ef38ff8e874a1606c3c847e478dcb3f6d4
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCE 10160 bytes
SHA-256: e534b063820dd010c790ae76efb2c5bbe56a1396276d258072a34c71d3eeb883

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